<template>
  <div class='sub-category'>
    <div class="container">
    <!-- 面包屑 -->
    <SubBread />
    <!-- 筛选区 -->
    <SubFilter @filter-change="filterChange"/>

    <!-- 测试复选框 -->
    <!-- <XtxCheckbox v-model="isAllChecked">全选</XtxCheckbox>{{isAllChecked}} -->
    
    <!-- 商品面板(排序+列表) -->
    <div class="goods-list">
      <!-- 排序 -->
        <SubSort @sort-change="sortChange" />
        <!-- 列表 -->
        <ul>
          <li v-for="goods in goodsList" :key="goods.id" >
            <GoodsItem :goods="goods" />
          </li>
        </ul>
        <!-- 无限加载组件 -->
        <XtxInfiniteLoading :loading="loading" :finished="finished" @infinite="getData" />
    </div>
    </div>
  </div>
</template>
<script>
// import {ref} from 'vue'
import SubBread from './components/sub-bread'
import SubFilter from './components/sub-filter'
import SubSort from './components/sub-sort'
import GoodsItem from './components/goods-item'

import { ref, watch } from 'vue'
import { findSubCategoryGoods } from '@/api/category'
import { useRoute } from 'vue-router'

export default {
  name: 'SubCategory',
  components: { SubBread, SubFilter, SubSort, GoodsItem },

  // setup(){
  //   const isAllChecked=ref(true)
  //   return {isAllChecked}
  // }


  setup () {
    // 1. 基础布局
    // 2. 无限加载组件
    // 3. 动态加载数据且渲染
    // 4. 任何筛选条件变化需要更新列表
    const route = useRoute()
    // 加载中
    const loading = ref(false)
    // 是否加载完毕
    const finished = ref(false)
    // 商品列表数据
    const goodsList = ref([])
    // 请求(查询)参数
    let reqParams = {
      page: 1,
      pageSize: 20
    }
    // 获取数据函数
    const getData = () => {
      loading.value = true
      // 设置二级分类ID
      reqParams.categoryId = route.params.id
      findSubCategoryGoods(reqParams).then(({ result }) => {
        // 获取数据成功
        if (result.items.length) {
          goodsList.value.push(...result.items)
          // 把page改成下一页页码
          reqParams.page++
        } else {
          // 加载完毕
          finished.value = true
        }
        // 请求结束
        loading.value = false
      })
    }

    // 在切换二级分类时候要重新加载
    watch(() => route.params.id, (newVal) => {
      // 路径也可以这样写('/category/sub/' + newVal)
      if (newVal &&  `/category/sub/${newVal}` ===route.path) {
        finished.value = false
        goodsList.value = [] //导致列表空的,加载更多组件顶上来,进入可视区,加载数据
        reqParams = {
          page: 1,
          pageSize: 20
        }
      }
    })

    // 1.更改排序组件的筛选数据，重新请求
    const sortChange=(sortParams)=>{
      // console.log(sortParams);
      finished.value=false;
      // 合并请求参数，保留之前参数
      reqParams={...reqParams,...sortParams}
      reqParams.page=1
      goodsList.value = []

    }
    // 2.更改筛选组件的筛选数据，重新请求
    const filterChange=(filterParams)=>{
      console.log(filterParams);
      finished.value = false
      reqParams = { ...reqParams, ...filterParams }
      reqParams.page = 1
      goodsList.value = []
    }

    return { loading, finished, goodsList, getData,sortChange,filterChange }
  }

}
</script>
<style lang='less'> 
.goods-list {
  background: #fff;
  padding: 0 25px;
  margin-top: 25px;
  ul {
    display: flex;
    flex-wrap: wrap;
    padding: 0 5px;
    li {
      margin-right: 20px;
      margin-bottom: 20px;
      &:nth-child(5n) {
        margin-right: 0;
      }
    }
  }
}
</style>